Article
Mathematics, Applied
Yongjiao Zhang, Igor Hoveijn, Konstantinos Efstathiou
Summary: We study the collective dynamics of globally connected coupled Winfree oscillators under external forcing. By numerical simulations and mean-field methods, we analyze the entrainment degree under different parameters and provide an approximation of the synchronization behavior.
Article
Mathematics, Applied
Dohyun Kim, Jeongho Kim
Summary: This paper introduces an active swarming model on the sphere with additional temporal dynamics for the natural frequency, inspired by a modified Kuramoto model. For attractive interacting particle systems, particles aggregate to a single point with common natural frequencies, while for repulsive systems, particles disperse uniformly over the sphere. Numerical simulations support the theoretical results presented.
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES B
(2022)
Article
Mathematics, Applied
Yushi Shi, Ting Li, Jiandong Zhu
Summary: This paper investigates the synchronization problem of the double sphere Kuramoto model on general graphs. The synchronization is proven using LaSalle's invariance principle, and exponential synchronization is achieved.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Physics, Fluids & Plasmas
William Qian, Lia Papadopoulos, Zhixin Lu, Keith A. Kroma-Wiley, Fabio Pasqualetti, Dani S. Bassett
Summary: This study investigates the influence of interaction topology on synchronization in networks of coupled oscillators. It shows that changes in connection topology alone can drive hysteresis synchronization behavior in networks of coupled inertial oscillators. Certain fixed-density rewiring schemes induce significant changes to the level of global synchrony, which remain robust to network perturbations.
Article
Mechanics
Henrique Nunes Lengler
Summary: This study investigates the applicability of the Method of Regularized Stokeslets (MRS) in simulating micro-swimmers at low Reynolds number, showing excellent agreement with the lattice Boltzmann method and analytical solution. MRS is well suited for this type of simulation, offering advantages such as ease of implementation and representation of complex geometries, making it a suitable candidate for more complex simulations.
Article
Mathematics, Applied
Md Sayeed Anwar, Dibakar Ghosh
Summary: This study investigates the influence of temporal and higher-order interactions on neuronal synchronization. The results show that neuronal synchronization can occur even with time-varying higher-order interactions alone. The enhancement in neuronal synchronization is highly related to the density of group interactions among the neurons.
Article
Physics, Multidisciplinary
Sagie Gadasi, Geva Arwas, Igor Gershenzon, Asher Friesem, Nir Davidson
Summary: This study introduces a method to control the chirality of symmetrically coupled lasers by introducing a special complex potential, resulting in the generation of nearly pure chiral lasing supermodes. This approach is applicable to any oscillator network, and the inherent nonlinearity of the lasers effectively makes the chirality extremely resilient against noise and imperfections.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Fluids & Plasmas
Xuan Wang, Zhigang Zheng, Can Xu
Summary: This study investigates the effects of many-body interactions on collective dynamics in a system of globally coupled heterogeneous phase oscillators. It reveals a sudden desynchronization transition and explosive synchronization, with mathematical arguments and stability analysis supporting the expected dynamic pattern. The work uncovers a self-organized phenomenon responsible for rapid switching to synchronization in complex systems with critical transitions involving nonpairwise interactions.
Article
Physics, Fluids & Plasmas
Joseph M. Monti, Ishan Srivastava, Leonardo E. Silbert, Jeremy B. Lechman, Gary S. Grest
Summary: This study calculates the static structure factors of large-scale, mechanically stable, jammed packings of frictionless spheres and disks with broad size dispersity. The analysis of the power-law behavior of the structure factors reveals that in three dimensions, the structural fractal dimension (df) is approximately 2.0 for -beta values between 2.5 and 3.8, allowing the collapse of structure factors onto a universal curve. In two dimensions, the fractal dimension (df) ranges from 1.0 to 1.34 for -beta values between 2.1 and 2.9. Additionally, the fractal behavior persists even after removing rattler particles, indicating that the long-wavelength structural properties of the packings are controlled by the large particle backbone conferring mechanical rigidity to the system.
Article
Physics, Multidisciplinary
Gayathri Vivekanandhan, Simin Mirzaei, Mahtab Mehrabbeik, Karthikeyan Rajagopal, Sajad Jafari
Summary: Dynamical map-based networks, with exciting behaviors, low computational costs, and more flexibility, can be used for studying the behavior of brain neurons. This paper investigates the regions of different collective behaviors in a two-layer network under different types of intralayer interactions, using the dynamics of the Rulkov map as the nodes' dynamics. The study reveals that the network exhibits various neuronal collective behaviors, including complete synchronization, cluster synchronization, chimera, and asynchronization.
Article
Mathematics, Applied
Pragjyotish Bhuyan Gogoi, Suresh Kumarasamy, Awadhesh Prasad, Ram Ramaswamy
Summary: This study investigates a system of coupled nonlinear oscillators with interaction modulated by their similarity. It explores a new route to oscillation death through a Hopf bifurcation, where individual oscillators transition from inhomogeneous limit cycles to different fixed points. The results include analytical and numerical findings for Stuart-Landau oscillators, as well as numerical results for coupled Rossler and Sprott oscillators.
Article
Geosciences, Multidisciplinary
Andrew P. Schurer, Gabriele C. Hegerl, Hugues Goosse, Massimo A. Bollasina, Matthew H. England, Michael J. Mineter, Doug M. Smith, Simon F. B. Tett
Summary: Climate models can accurately simulate the most important modes of climate variability, but cannot predict their observed time evolution. This creates uncertainty in estimates of forced change and makes direct comparison between observed and simulated variability difficult. this research investigates the role of three climate variability modes since 1781, evaluating their evolution and how they mask or enhance forced climate trends. The results show that assimilating these modes improves the accuracy of simulations in many regions and reconciles simulated and observed cooling after volcanic eruptions.
CLIMATE OF THE PAST
(2023)
Article
Mathematics, Applied
Hansol Park
Summary: In this paper, a high-dimensional Winfree model is presented, which is extended to a Winfree sphere model for synchronization on the unit circle. By restricting the support of the influence function, new conditions for complete phase-locking states are obtained, and the complete oscillator death (COD) state is proven from exponential l1-stability and the existence of equilibrium solution.
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS
(2022)
Article
Multidisciplinary Sciences
Christian Kuehn, Christian Bick
Summary: Critical transitions are observed in complex systems, such as synchronization in coupled oscillator networks and epidemic states in populations. The emergence of explosive first-order transitions has garnered attention when classical models are generalized with additional effects. Mathematical arguments suggest that the change in criticality is universally expected when a classical model is varied along a generic two-parameter family. Three explicit examples of this effect are illustrated in different physical systems.
Article
Physics, Fluids & Plasmas
Alexander Golden, Allyson E. Sgro, Pankaj Mehta
Summary: The study explored the control of spatially coupled oscillator systems, specifically focusing on how the spatial distribution of drive signals affects the frequency ranges of synchronization. It was found that boundary conditions play a significant role in synchronization to external drives for complex Ginzburg-Landau equation model. Additionally, a low density regime in the generalized model allowed for synchronization of a broad range of frequencies at low drive amplitudes.
Article
Biochemistry & Molecular Biology
Gerard C. L. Wong, Jyot D. Antani, Pushkar P. Lele, Jing Chen, Beiyan Nan, Marco J. Kuhn, Alexandre Persat, Jean-Louis Bru, Nina Molin Hoyland-Kroghsbo, Albert Siryaporn, Jacinta C. Conrad, Francesco Carrara, Yutaka Yawata, Roman Stocker, Yves Brun, Gregory B. Whitfield, Calvin K. Lee, Jaime de Anda, William C. Schmidt, Ramin Golestanian, George A. O'Toole, Kyle A. Floyd, Fitnat H. Yildiz, Shuai Yang, Fan Jin, Masanori Toyofuku, Leo Eberl, Nobuhiko Nomura, Lori A. Zacharoff, Mohamed Y. El-Naggar, Sibel Ebru Yalcin, Nikhil S. Malvankar, Mauricio D. Rojas-Andrade, Allon Hochbaum, Jing Yan, Howard A. Stone, Ned S. Wingreen, Bonnie L. Bassler, Yilin Wu, Haoran Xu, Knut Drescher, Jorn Dunkel
Summary: Bacterial biofilms are communities of bacteria that are essential to microbial physiology, with a complex relationship between single-cell behavior and collective community behavior. Biofilm microbiology, a relatively young field, has attracted physicists who use physics to study fundamental concepts in bacterial biofilms. The combination of physics and biology in this field exemplifies a new synthesis, rather than just a division of labor.
Article
Physics, Multidisciplinary
Babak Nasouri, Andrej Vilfan, Ramin Golestanian
Summary: The research derives a theorem for the lower bound on energy dissipation rate by microswimmers and proposes a new definition of energetic efficiency for microswimmers. Experimental results validate the theory.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Fanlong Meng, Daiki Matsunaga, Benoit Mahault, Ramin Golestanian
Summary: The study reveals that the collective behavior of magnetic microswimmers in a microfluidic channel can be analogized to Bose-Einstein condensation, achieved through a non-equilibrium phase transition, with the potential to generate exotic classical nonequilibrium phases of matter similar to those observed in quantum systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Saeed Mahdisoltani, Ramin Golestanian
Summary: This study shows that electrolytes driven by an external electric field exhibit scale invariance despite Debye screening. Long-range correlations result in a Casimir-like fluctuation-induced force between neutral boundaries that can be controlled by the electric field, behaving differently from other fluctuation-induced forces.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Vincent Ouazan-Reboul, Jaime Agudo-Canalejo, Ramin Golestanian
Summary: Biomolecular condensates in cells are often rich in catalytically active enzymes, particularly in large enzymatic complexes called metabolons. The self-organization of these enzymes may be explained by a combination of catalytic activity and chemotactic responses to gradients of substrates, leading to non-reciprocal interactions with exotic features. The study of phase separation in mixtures of catalytically active particles reveals a Michaelis-Menten-like dependence and transient oscillations, highlighting non-equilibrium organizing principles important for biological liquid-liquid phase separation.
EUROPEAN PHYSICAL JOURNAL E
(2021)
Article
Mechanics
Abdallah Daddi-Moussa-Ider, Babak Nasouri, Andrej Vilfan, Ramin Golestanian
Summary: The study reveals that the optimal propulsion strategy of microswimmers depends on their shape profile, which could be puller, pusher or neutral. Among all the modes of the shape function, only the third mode determines the swimming type of the optimal swimmer at leading order.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Multidisciplinary Sciences
Fanlong Meng, Rachel R. Bennett, Nariya Uchida, Ramin Golestanian
Summary: In this study, a theoretical framework connecting the dynamics of an individual cilium to the collective dynamics of a ciliary carpet via coarse graining is presented. The criteria controlling the selection of frequency and wave vector of stable metachronal waves of the cilia are uncovered and examined. Agent-based numerical simulations of arrays of cilia with hydrodynamic interactions show quantitative agreement with the predictions of the analytical framework.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Biology
David Hickey, Andrej Vilfan, Ramin Golestanian
Summary: The protruding geometry of cilia could be one of the reasons why so many receptors are located on cilia, as shown by comparing the capture rates. The study also highlights the advantage of combining motility with chemical reception.
Article
Physics, Multidisciplinary
Jaime Agudo-Canalejo, Tunrayo Adeleke-Larodo, Pierre Illien, Ramin Golestanian
Summary: This study explores the stochastic dynamics of two enzymes that are mechanically coupled to each other, demonstrating that this coupling can greatly enhance their catalytic rate. The findings suggest that enzymes, despite being on a molecular scale, can cooperate and improve performance in metabolic clusters.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Laura Collesano, Isabella Guido, Ramin Golestanian, Andrej Vilfan
Summary: This study focuses on a system that consists of a pair of microtubules clamped at one end, and investigates the static shapes and active dynamics of this system. The results show that the system transitions from a planar shape to a non-planar shape and then back to planar shape as the length ratio between the two filaments increases. The predicted shapes of the microtubule pairs agree with experimental observations. The dynamical system of this two-filament system can have stable fixed points or limit cycle oscillations, which resemble ciliary motility.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2022)
Article
Multidisciplinary Sciences
Andrea Testa, Mirco Dindo, Aleksander A. Rebane, Babak Nasouri, Robert W. Style, Ramin Golestanian, Eric R. Dufresne, Paola Laurino
Summary: Living cells can harvest environmental energy to drive chemical processes. Here the authors design a minimal artificial system that achieves steady states at similar metabolic densities to microorganisms.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Lorenzo Piro, Evelyn Tang, Ramin Golestanian
Summary: This study builds an analytical formalism for overdamped microswimmers on curved manifolds and arbitrary flows, revealing that the solution corresponds to the geodesics of a Randers metric. Swimmer performance following this Randers policy consistently outperforms a more direct policy, with relative gains growing significantly when specific structures related to either the geometry or the flow are exploited. Analysis of isochrone shape unveils features such as self-intersections, cusps, and abrupt nonlinear effects. This work establishes a connection between microswimmer physics and geodesics in generalizations of general relativity.
PHYSICAL REVIEW RESEARCH
(2021)
Article
Medicine, General & Internal
Philip Bittihn, Lukas Hupe, Jonas Isensee, Ramin Golestanian
Summary: The effectiveness of regional containment strategies during COVID-19 pandemic is influenced by key parameters such as leakiness and regional structure. Lower proportion of cross-regional contacts and subdivision of regions can lead to more efficient epidemic control without impacting local socioeconomic freedom.
Meeting Abstract
Biophysics
Evelyn M. Tang, Jaime Agudo-Canalejo, Ramin Golestanian
BIOPHYSICAL JOURNAL
(2021)
Article
Physics, Multidisciplinary
Saeed Mahdisoltani, Riccardo Ben Ali Zinati, Charlie Duclut, Andrea Gambassi, Ramin Golestanian
Summary: The study presents an unconventional mechanism for interactions within biological systems, proposing that self-organization is driven by the interaction of polarity particles via chemical signals. The research utilizes an exact stochastic formulation and dynamical renormalization group analysis to reveal the emergent Galilean symmetry and dynamical scaling exponents at the critical point. These findings indicate superdiffusive density fluctuations and non-Poissonian number fluctuations that can determine the large-scale behavior of cell colonies and tissues.
PHYSICAL REVIEW RESEARCH
(2021)